Which cup size is bigger B or C?

The difference between measuring all over your bust (A) and measuring sub-bust (B) gives the size of cup A - cup 12-14 cm difference. B - cup 14-16 cm difference. C - cup 16-18 cm difference.The cup size is given by the difference between the measurement across the fullest part of your bust and the under-bust measurement. The cup is 14-16 cm bigger than the B. The cup has a difference of 18 cm.